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Oklahoma Water Hardness

3 cities · average 11.9 GPG

Average hardness

11.9 GPG

Hardest city

Lawton 13.7 GPG

Softest city

Oklahoma City 10.5 GPG

Tier distribution

Very Hard1Hard2

Cities ranked by hardness

1Lawton13.7 GPGVery Hard2Norman11.4 GPGHard3Oklahoma City10.5 GPGHard